Illuminating Dark Energy

David Chay Benisty (Leibniz-Institut für Astrophysik Potsdam)

Dark energy, commonly associated with the repulsive effect of vacuum energy, drives the accelerated expansion of the Universe. More than twenty years after its discovery, new observations—most notably from DESI BAO—suggest that dark energy may deviate from the standard paradigm. In this talk, I will illuminate the nature of dark energy by examining its signatures across scales, from the largest cosmological distances to the local environments of galaxy groups and clusters. I will demonstrate how these multiscale effects provide critical insights into the underlying physics and discuss how upcoming surveys such as DESI and 4MOST will support the next generation of tests of dark energy and dark matter. The presentation will highlight the interplay between cosmology, observations of the nearby Universe, and potential interactions between dark matter and dark energy.

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The colloquium will be streamed but not recorded.
Zoom link: https://uni-frankfurt.zoom.us/j/2848286010?pwd=VmtCY1RCc1hpVStKd0RibFBpc1IzZz09
Meeting ID: 284 828 6010
Password: 068695